/**
 * gwt-validator 
 *
 * Copyright (C) 2006  Nikolaus Rumm, Christian Simonutti
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package gwt.validator.client.action;

/**
 * Interface that defines the contract between the condition implementation and
 * the framework.
 * 
 * Conditions can be used to evaluate some fact and use the evaluation result to
 * control the validation process.
 * 
 * @author <a href="mailto:nikolaus.rumm@gmail.com">Nikolaus Rumm</a>
 */
public interface Condition {

	/**
	 * Callback method that evaluates the condition.
	 */
	public boolean isTrue();

	/**
	 * Callback method that tells the condition that it's result has been used
	 * to actually call an action.
	 * 
	 * This information can be used by the condition to update it's internal
	 * state (i.e. increase some counter).
	 * 
	 */
	public void actionPerformed();
}
